Fix pranked CREATE2 address preimage

[forkforkdog]

Summary

• Use the pranked deployment source when deriving CREATE2 addresses.
• Add a regression test for vm.prank followed by new ...{salt: ...}().

Root cause

The CREATE2 path applied overrideCaller to the constructor caller/deployment source, but still derived the CREATE2 address from self. That made the deployed address disagree with the pranked deployer semantics already used by CREATE.

Validation

• git diff --check
• solc --bin on the added Solidity regression fixture